Add Edit Update Delete in DataGrid control in ASP.Net

Hi. im trying to add edit button in my gridview.  when click in that row the values will automatically filled up the textbox. Im done w/ remove button. here is my code

<asp:GridView ID="gvAddedPersonnel" runat="server" AutoGenerateColumns="False" CellPadding="2"
                            Style="width: 100%" onSelectedIndexChanged="gvAddedPersonnel_SelectedIndexChanged"
                            ShowHeaderWhenEmpty="True" onrowcreated="gvAddedPersonnel_RowCreated">
                            <Columns>
                                <asp:BoundField DataField="serial_no" HeaderText="Serial Number" />
                                <asp:BoundField DataField="warranty" HeaderText="Warranty" />
                                <asp:BoundField DataField="status" HeaderText="Status" />
                                <asp:BoundField DataField="remarks" HeaderText="Remarks" />
                                <asp:BoundField DataField="floor" HeaderText="Floor" />
                                <asp:BoundField DataField="rack" HeaderText="Rack" />
                                <asp:BoundField DataField="room" HeaderText="Room" />
                                <asp:BoundField DataField="shelf" HeaderText="Shelf" />
                                <asp:BoundField DataField="active" HeaderText="Active" />
                                <asp:ButtonField CommandName="select" Text="Remove" HeaderText="Actions" 
                                    ButtonType="Link" />
                                <asp:ButtonField CommandName="edit" HeaderText="Actions" Text="Edit" ButtonType="Link" />
                            </Columns> </asp:GridView>

code for remove in Gridview.

 Protected Sub gvAddedPersonnel_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles gvAddedPersonnel.SelectedIndexChanged
        Try
                 Dim dtUpdate As DataTable = DirectCast(Session("dt"), DataTable)
                dtUpdate.Rows.RemoveAt(gvAddedPersonnel.SelectedIndex)
                gvAddedPersonnel.DataSource = dtUpdate
                gvAddedPersonnel.DataBind()                
          Catch x As Exception
        End Try
    End Sub

How can i add the update button w/out conflicting to remove. thanks in advance